Interface Level

Solaris DDI specific (Solaris DDI).

Parameters

dst

Pointers to character strings.

n

Count of characters to be copied.

s1, s2

Pointers to character strings.

Description

These functions operate as efficiently as possible on memory areas (arrays of
bytes bounded by a count, not terminated by a null character). They
do not check for the overflow of any receiving memory area.

The memchr() function returns a pointer to the first occurrence of c
(converted to an unsigned char) in the first n bytes (each interpreted as
an unsigned char) of memory area s, or a null pointer if c does
not occur.

The memcmp() function compares its arguments, looking at the first n bytes
(each interpreted as an unsigned char), and returns an integer less than, equal
to, or greater than 0, according as s1 is lexicographically less than, equal
to, or greater than s2 when taken to be unsigned characters.

The memcpy() function copies n bytes from memory area s2 to s1.
It returns s1. If copying takes place between objects that overlap, the
behavior is undefined.

The memmove() function copies n bytes from memory area s2 to memory
area s1. Copying between objects that overlap will take place correctly. It
returns s1.

The memset() function sets the first n bytes in memory area s
to the value of c (converted to an unsigned char). It returns s.

Usage

Using memcpy() might be faster than using memmove() if the application knows
that the objects being copied do not overlap.

Context

These functions can be called from user, interrupt, or kernel context.